build: fix bootstrap, set language to C++

Bootstrap script doesn't start with #! line.
Set the language in the build to C++.

Change-Id: I171dac4550063655b11d88af7009f5f6d129a34f
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/bootstrap.sh b/bootstrap.sh
index ee24b53..1bca169 100755
--- a/bootstrap.sh
+++ b/bootstrap.sh
@@ -1,7 +1,9 @@
+#!/bin/sh
 # SPDX-License-Identifier: Apache-2.0
 # Copyright (C) 2018 IBM Corp.
 
-#!/bin/sh
+set -e
+set -x
 
 AUTOCONF_FILES="Makefile.in aclocal.m4 ar-lib autom4te.cache compile \
         config.guess config.h.in config.sub configure depcomp install-sh \
@@ -17,5 +19,5 @@
         ;;
 esac
 
-autoreconf -i
+autoreconf -vfi
 echo 'Run "./configure ${CONFIGURE_FLAGS} && make"'